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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bd35cd6f337161d5fbf1e97e1a8ed7246d542c2fd550ed7bb7c0da0fc72e82' 
  AND token = 'nDQhDvqLcXk9SotL68AUXae/8/DzixWfcYGDV3pRVyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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