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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ea798a7bace8709cd24c06fd96d78a60a450a3d847f66d0c35b89254fa5f49e' 
  AND token = 'Kxoq6e1/aK4xhR9LIMAdpsGhx3sInQgjfcFbNvobZdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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