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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f8268e213e712c025b521a0864f413dcf43aa0f4d63e3c7be922c2dd6cac14' 
  AND token = 'UDhqWk8JIWachvB8B5gqEtP9Au2IqdUl4b8dIr0Aw8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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