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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80497422bf0bb8f6562e07bca0d9f565c5ad8c40e65bf35c78cfe7d65a2ee9d' 
  AND token = 'DSY1vOZmaC8l8sIdHHubS6MLQ1mcn4EYZAeI1NgrYX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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