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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9663e502942f0cdcef2c7167fc09193fe8b03ee5c6d987cbc5b14b6f0b621f' 
  AND token = 'VocTIOlfo1Js+a5m4btD8xKRpYKS7wF2YLGplGpXO3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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