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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b65d212ebd8583f316716b2de09bad98291b5ae6282a3c96c982f67460991056' 
  AND token = 'KPqFDlaltxEzC6GUxnDzBAuLSb/ZdNllbSPjNVpOptE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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