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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894737247cb649daa14dd44280b6a6241da82a508297545f2a7afabe9201cd98' 
  AND token = 'Q8392MjK0jqgIS8BxzKSJO4N7aXU7i3PmyC9S1zh9uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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