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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701f47ba36dfc37f7e7cec724968a8db8587fb2fe68064ecf0e868383c5c60a6' 
  AND token = 'AxXD9cblEmiAfqoFKVBAEhhVU+xHpOwVQJV255Oyq+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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