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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8f0a2e347ed5ecba0ddd652a8581be3c6e4be59edbdf0452159a7d17b27243' 
  AND token = 'QeQS33CHMJj+qEPh3Ye4TfoXagevrVlbnxwDHTY9P7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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