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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a87fb12e1062ef4634f184f77adf44cc70eb6c234cf0fb6e41db0809d0a91d' 
  AND token = '0iLQtMEY2j65l+nbh/pumrNbbnJFtJlghh4c3folxgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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