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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1720b5f82056bf40641e192f6c31b84472082408336e70f23b84dc04b3a7ec3d' 
  AND token = '70Opk+5uifwxMkSev+c5wZ/xPPA8xWxCzw/OYoPBDPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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