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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4f5d3698495062e888ca78c4d2f9556037b1ae39a10bf820ad2794348baaa4' 
  AND token = '6tBapvq51wtoPKA7qPha65rGOBYOO//i9zCt409MgME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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