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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983a75c9f1bd998b37c626a6b271eb90733e36a9d6f0339cd29f30dcd0824c5d' 
  AND token = 'kgThjUD203uvQdOVc4uhwXup60JNcBeqZD554VH4EUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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