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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b03227d256faa4d0ab52b6672c3a0acc0d08198328c9659fe7f405eadaea72f' 
  AND token = 'toRqeXrzoCP0qsizST4wP6kr0DUoKnRFfffzKiz7NPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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