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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94f75914564da29b04bc6968156399ad341e3d2a164ce2ab3d6ace21e39b45d' 
  AND token = '4jBLraMyEULu3h4V1uR6AlgCjayYfTyNII0zQLajyf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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