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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32965ca512ccd47630a9db31317f3d38da2836ee2cf87ce648e0ec0da5d4dec' 
  AND token = 'qbOZKRZDYt6Dt9J/UB/LjtO5rlsgOyUnehlWEXtLkmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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