SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3a018f01a5edcb9ed040a65cb586c2fb71521d254d498de8fb9666a27970ca0' 
  AND token = 'JE1pCCbVBmeY4tq63+Djhz3Qw6QsLj+KCOERzyEXyxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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