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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb9abd830a93ff7e996900bbe0b64e62d480757fea6069fad964e459e1a0f097' 
  AND token = '8jD3TYdrcBqUniYvqMBlfdUN6/vJPuqlxzEZ9DSBq0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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