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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a792eb2e362d0e126bd2aaf7b3e59260590ddc8148b0e3e1d6a309e4b210c0f6' 
  AND token = 'B85Iz3wxA6pR5KY0fNIqE19RjRXbWyKqWxPbHiHjTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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