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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc12b658eb73cafa3ca4d1aecf17d19e45d5999eae639dec02dff3811d7d51f5' 
  AND token = 'eK3OFa68Gk8WCIFWgJtBc+S5oCtYMIUe4+NyHqtYgjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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