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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938559997780ef2380e6b39168e2c0e98cb510f5fe10693a0690b8045cc39cfb' 
  AND token = 'wnu3oGcvavk7SOuWtCHK1TRmpx3npzGfN6lGGFYJGuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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