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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345595aad5438634063e3bb14f1867a9b03085a5b24b235530531442699b0b62' 
  AND token = 'EJ53wW59KNpav5yqD2bjsTbroH3nfEGKi5X+QdXNS+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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