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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b049f64ccb73ba3bf4eced6ccbf37ed4d973d2aa0e11a4ea3c4ba976af367843' 
  AND token = 'IvVaeDMSv/kbG3JHUOp3lJtXRfDORWbR/DJUCk29u14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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