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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e38a85080656067d078f7ff4bc445807507d706c5c430b8b919e3d771de6249' 
  AND token = '3Cz8nWE0KtED3xIJclNxGR9OpWqp18CZUiGWeQLWR7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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