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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94720bfb96f93d126a6f8cf988220884c1215dd929d8fc4ebc5ef28d0351171f' 
  AND token = 'kLyzOaaaHnGLWgsiqaT2FzVfSRudvjvKZflqj7QFo2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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