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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da65d51539c5be57c00eb3097649de704ab7bfacb9b5d55600619fac1014783' 
  AND token = 'nklq34Tcf992jyaWjs4hLFxMnPVG6j1AAp8kQWaXCVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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