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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a53d65a7f5f0763d02d31adb3d2dc950ba44060d229b389ec0fd50b4db56ee9' 
  AND token = '3TyNvt7vjoVmXevOv0U/97G380D1BTuIVa6FhF+Rgrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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