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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd87d54f7afe659966ab111172676ee3c710a94e9522f3da0c53835d7ede467' 
  AND token = 'DPEosRizKjTZfWMP8XspdfF7QVLY62qJRMawh7F66O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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