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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f1a3ca5ee68a7e47de09f08ac4a8ad0a446fe580f7990f31ff084d3052d85f' 
  AND token = 'g+KoB5LScqCHVPnNWHnj9xZMU4Gjdff3jhIL9a3JFag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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