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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4987e5476f50a7914c6a19249a764eb526b4804da498a58b720a43ce88fc7ab' 
  AND token = 'H0obIiR5Ov8eoJhe6zhxTgqKFQ0tEi9z71leUbQchRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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