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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '889da18b35aa56a509de2bba467efb84820b0c452eae9dcb5293785bb198313d' 
  AND token = '9JcEMENeWsI1j5xiLDRgCUFk7f7f55EDoeWF3hdLevg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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