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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66b8bd7dc64cf8646e027eace53b023a6bad7dd7c517c28b902809c3132a58b' 
  AND token = '3qWPSu0d55R2ZhbrLKyj/HSE59lQKeelHEF/JY7WRw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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