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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259605ee74e5be903143ace8eef31ab5400cbb190729fb97a519b8ea9c56c48d' 
  AND token = '5/2Z3gnIkDrHn5sei68Lfxgw/+1Y/Icq8dQuy2hImLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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