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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f3551dd5bb7334bfca0c27d515298dc677ce288d2a9809b7a166ec4f8b585e5' 
  AND token = 'JhP5bre9ITI2ntKxiVqLI0GsDUa4FWfj2tvl26Rexj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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