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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b3a3be7c2f6d9b5e335df299692c215509236ae4fc3f0a7fef97c41a2d5cb2' 
  AND token = 'P81WWxFZEmyA4tJY+UmvWmPyzM66XveNhesq3ZjwSvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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