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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0c151ce0b76847ff3f081786e2e9d602d6df31d54ccac39d7e3e9f34a97fd9' 
  AND token = '0LwomZer+ibYomLMpjVHHT+KpM7IFypt/aWN2uQz1wU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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