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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79733106b835d52a96ef7a80df6b7e8193117d3846a638ac36a412fe33cd3eec' 
  AND token = 'IO7UU8Rc+ZhentoXrnoPdaSOnh/Wub/WTB5LPt/tRkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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