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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e604ebde18426cee2bf59ac2b1ddd5e1845a3c31d88820797467456557578b' 
  AND token = 'Uat8ZRotzpXiDDaKmtU8+XMbzfWoN9wfTkbzlcmz22U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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