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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c53539e1bf58ceafaa8efa73b0c1f312aa3c0e1a2effa5c6c5160177e2e83c' 
  AND token = 'b6cUVsPYM1/f53J5tw4/l1UIy0f/7U7P4XYeESMIf5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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