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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d73908ed8ad59ca4b6366c2d126a33ce15280c69119c97e67980d4c7be6e66' 
  AND token = 'R1NwFjsrGl7KlpRET3xYGGk4MOp+t5DwrcjExaiXg8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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