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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69ccdd6f34452ff8f2a361af8474e94dbd16284adb10c70e3a119180df29276' 
  AND token = 'fmHa1AXTJ5Ahh5gPTid57Ai7R6HChbaOkRuC7N0Cu7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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