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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4b2ac340e7d77beced3ebe9cad4944ef469c2495a0dcfedc785b5b351434ad' 
  AND token = 'hf6rO7dKmf6gjsAq2ORRaoL/295UvfEmZj0Mzp2APno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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