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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3646c768093fca7202d6aeacdddc88dc84680c3270d2dce2da5b134d3feece6' 
  AND token = '10vRP8cnfIj4vT6cn9100+m1O8xrYbPI8PKbw3m4hxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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