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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32fc836cc6bd8df569734ceae71b3ef4b0b306f6b484c0e3d75b6c11b4428f5a' 
  AND token = 'dPz1wOty8NR8z/UApMZjPd+kbhtMOUYFhXzo10N7jpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}