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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec9dc9e1cd3468d8982a6f0c3ba9f656ececbfa059d67572c52ffbffe8a6d8d' 
  AND token = 'vp/FDZ4LuKAnX2KdlNRUlp/Wx43s4Hae0I87XR14jKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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