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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed79d5ea9edec1396052b35dfff1d15be1558291db53ef7b64e256a530226a1f' 
  AND token = '/rf98R/yj5mvfKosTpdyF9Ao3Qgo1zmc2OWVXc/qBMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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