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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09d207ce5d237cb2535132c738627b36b1adef3c37a8cfb464e7446da7e480b7' 
  AND token = 'ZUJqXS5V1+fAlsWISatQ6ZG3ftphGsrv/kJJC764Qb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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