SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4529faa5a8b0898ff25375f136efd10f7d00cb8a1560ff96000717e8188c2c74' 
  AND token = 'lPqmgKWzLPcswXvZEyNZdljL62OpED+Yv0lFW+Wu7pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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