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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd553061fac30ca387bd19094287e896b479de4c47fb684f0e216235a287024c3' 
  AND token = 'nDxd0mmRv7rk0r1DECt98tCDWecx6F0cHQ83ML0lyLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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