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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b169548fa5e67500611ff28103096c4270f02a331be6f89b0c46bb91f42a1b23' 
  AND token = 't9WSYSaKquLE05W22ux13t7EfqzzPafs2cqR4eYLU+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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