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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c40ae51551394c65b13b1d1cddedbf37f976ab0d83ed67e8cd51b4c15edea9fc' 
  AND token = 'cKAWQ7+q99BIKcdDuHSIQFDpUPwWczAFpvPHwUAg6i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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