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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c9aec203897ef8d50ebd134118b75af2af84f634b75ed961092da4bfece5053' 
  AND token = 'QtkAw8idOoeQ3dirTH/Nm9j7Yod/tdTBNLJ1OK2N964=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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