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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff44e38de4da7040c5c34f1ee588f3a6d244dd69de7cd07bb1e43e74eb1da76' 
  AND token = 'wT8MkRy8fvIy796sdSUGRHOYLp/gCzF/n/owsYFNvTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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