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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd81a1e1c65f744941d1e171b1e38d4f6818681584be5867ceb940f8f5ebfad6a' 
  AND token = 'Bj14pHZeYc159rmPaZxXJ1qF6bY0C/YemvPmdlZYSmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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