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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6dbb16b5506d5d606d22c4fc7974a0098c1d20059e2035c50dd739946d75d7' 
  AND token = '/oDW0DIymxdX/r6F8s0lmpmVDBtX5dQIOrGVK1cSu9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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