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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4767eb74e47174978ea1aa0a088079eb18321f50ed79cf942b4ecdce5908ad7c' 
  AND token = 'eDd5y4M4WeE1nAy9bC72IWsyxPC4PeQr2WeUsdyT4xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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