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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a667e1f98594d76fe9b873370540bdb6105fdb5e84e1ce58537034746638441e' 
  AND token = 'C+e67ZQh33WlITT/Z6/kqznhRfx4fihk1G31p+6rmY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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