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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f40c62a0ebc0ea6db83f6b6b4a749ee4957884b065c36cc11ca61a4e5ca0ab' 
  AND token = 'vRa5NST/v9tRmQpUqniEj35eHc/QseefAUOYBFB2E3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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