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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c3ec4e34d6314404bdea9bc105c7b62410a6c5afa19c5db417fb8979bbff34' 
  AND token = 'pjq2mZ5a96i5HZs7faFOol9yjX2F4RVkcKFtsgQfDYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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