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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e32c34c95178a06e506bbf8708b2cce6305257be0614cfd09cdf912d9a7eb4d' 
  AND token = 'GoYgalKMYNpthtFN3fCNGgKesYJUmVVc6Yc1oc9YSlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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