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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f69c587d5731d5e0c023deebe88a7bcc2d9c5c1356e159b3afcb90cc2b1ee6' 
  AND token = '/kjsONpIZ8oVcEfcM/QVvT8N+fs9eVMxyCUgkvC8HNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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