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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641413821f6b211f761479f79e2423e6026e2d5a286b85ca4b3a0c654a9a36d6' 
  AND token = 'WgUxFdZRssNevRxtl8UEh//SvfxoDP/ExgkwqFsjrDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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