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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cf589cf295eb2757a7fc0ecd5f257f060a3ba89fe96fe0e7197dd182763fc1' 
  AND token = '8UJmtRxeX+GXmc+m2n7btmZnfgcVzTUIyOe0S4MIu3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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