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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47d3cf4dbd5b47f30440740209cd3911da8f5f97111c19b60cc294108676ef57' 
  AND token = 'rzDzLyGj+GU8tNKF5th3UkkZQgjj3LR4dHl6yDTmnUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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