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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536245a365c50e0709a2f10026b92a72c20719c5c355f52ca8457d15d1207f4d' 
  AND token = 'tVf2Ef1FeeiHgYS+U1s/gzJg9zuQVo1fEhFvqzFYGWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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