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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dac8a710243c4b0ace8821bc75ead430bec84604b4620eefee0df13242b244e' 
  AND token = 'KvZWSmYQthbR4dqreZ1JV9AynZW+2MBCylQev0Pa49U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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