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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bb9d6de5fe04db33b71f5529b25a385fb2a2634b7230c5324a7932fadd89109' 
  AND token = 'dPFfGZtEQ8966TJ+7wzjze8sXo4prrdfTO+7mRdrUfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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