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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95378b18d33fd14ddcf5b7e9bff05c64d4632732fe85e2618f6ba14e28ccde78' 
  AND token = 'dUaUAEdaFfozdVgFzIAQkm8hVdfKyBcj0dTj7KP8XLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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