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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3177d882866be3004522c8714c8c58ca1b512818b8d0916d8f3ef73713e4eb0' 
  AND token = 'mrNxHvM05xBG0kc7bLSOLK1QBxcxd7X+DWZY67PxLKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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