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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846f0ea94e1895064e5ecfacace76ee2aa76cfa998989f84dd47f4bda8e93cfc' 
  AND token = 'yEyP9cGmM9L9E1//KQWImL3K9UevD+GwHTUrmkDSJ60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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